单项选择题

The workers were paid______in this factory.

A. by an hour
B. by hour
C. by the hour
D. by hours
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单项选择题
The noise was caused by a dog______ mouse through the back door.
A. catching
B. fighting
C. following
D. chasing
单项选择题
There are two spare rooms in the building,______has been provided with air-conditioners.
A. neither of it
B. neither of them
C. neither of which
D. neither of this
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